Air-pump for steam-engines.



No. 755,938. A i PATENTED MAE. 29, 1904.

E. RICHARDSON. AIE PUMP EOE STEAM ENGINES.

` APPLICATION FILED AUG. 11, 1902.

N0 MODEL.

vof corresponding shape.

Patented Mfarch Q9, 1.904...

PATENT OFFICE.

ROBERT RICHARDSON, OF GLASGOW, SCOTLAND.l

AIR-PUMP FOR STEAM-ENGINES.

SPECIFICATION forming part of Letters Patent No. 755,938, dated March29, 1904.

Application filed August l1, 1902.

T0 all whom, 'it may concern.-

Be it known that I, ROBERT RICHARDSON, engineer, of 16 Jamieson street,Govanhill, Glasgow, Scotland, have invented certain new and usefulImprovements in Air-Pumps for Steam- Engines, (which have been patentedin Great Britain,`\lo. 1,7 26,dated January 221902,) and I do herebydeclare that the following is a full, clear, and exact description ofthe same.

This invention relates to air-pumps of the vertical-cylinder type; andit has for its object to provide a double-acting pump from which the airwill be forced through the outlet-valve orifices in advance of thewater, so that efficient working is insured. l The invention isillustrated, way of eX- ample, in the accompanying drawing, which showsavertical section of the improved double-acting air-pump.

As therein shown, the pump-casing A is adapted to be attached to theside of the condenser of a steam-engine, from which water ofcondensation flows into the casing A by an inlet C to an annular passageD, from which it passages through perforations e in a liner E, fitted inthe casing. In the liner reciprocates a combined piston and plunger F,attached to a piston-rod G, passing up-through a cover I-I on the linerE, and a stuffing-box I im the cover J of the casing A. The lower orplunger end of the pistion is preferably of convex form, as shown, andthe lower end of the casing A is When the piston descends under theperforations e, the water flows through them into the inside of theliner, and on the ascent of the piston the water,with any air or vaporwhich rises above it, is forced up through Valves K in the cover I-Iinto the outer casing A, from which it passes by an outlet L to thehot-well or other receptacle. While the piston rises, water accumulatingand passing from the condenser passes through the orifices e to thelower end of the casing A, and on the downstroke of the piston itsplunger end displaces the accumulated water, so that it rises over thelevel of the lower end of the liner E and traps the air or vapor in anannular Serial No. 119,291. (No model.)

pocket M, forming an extension of the casing.

The air is by the further descent of the plunger driven in advance ofthe water through valveorifices N in a partition O into the dischargeend of the casing. The pocket M is formed `mainly at one side of thecasing and is inclined or tapered as shown, by the dotted line P, towardthe opposite side when the air-pump is intended for marine use, so asto-insure that notwithstandingl any list of the ship the air will betrapped and discharged in advance of the water. The `relative capacitiesof the pocket M and the water-space from the bottom of the casing A tothe lower edge of the liner E should be such that the water-level willnot be raised to the edge of the liner before the descent of theplunger, thus trapping the air within the liner o r before the air hasbeen driven into the pocket.

By the arrangement described the piston or plunger is in contact withand is sealed by water in both the up and down strokes, and thepossibility of air passing between a looselyfitting piston and thecasing or liner is obviated, so that an eflicient double-acting airpumpis produced.

Having now described my invention, what I claim, and desire to secure byLetters Patent,

A double-acting vertical air-pump comprising a combined piston andplunger F, acasing A having an opening L, a cylindrical liner E fittedin said casing and having orifices e connecting the inside of the linerwith an annularpassage D without the liner, a cover H on said liner,valves K on said cover connecting` the interior of the liner with thecasing A,a pocket M forming an extension of said casing and valves Nconnecting said pocket with the upper end of the casing substantially asand for the purpose set forth. Y

In witness whereof I have hereunto set my hand in presence of twowitnesses.

ROBERT RICHARDSON. Witnesses:

WALLACE CRANsToN FAIRWEATHER, J No. ARMSTRONG, Jr.

